The GSE Mid Clamp – Black range is the central fixing clamp used within the GSE In-Roof System to secure two adjacent framed PV modules to their mounting frame. Also referred to as a double clamp in GSE's installation manuals, it sits between neighbouring modules in a row, clamping both panel frames down onto the half-frame at a single shared fixing point.
This listing covers four GSE mid clamp variants used across the Portrait and Landscape In-Roof ranges, sized to different PV module thicknesses per GSE's official clamp engineering datasheet. Always confirm your module's exact thickness and which frame system (Portrait or Landscape) you are working with before ordering, as the variants are not interchangeable.
4
Variants Available
H16 / H21 / H27
Clamp Sizes
30-46mm
Module Thickness Range
Black
Finish
Included
EPDM Seal (all variants)
Mid / Double
Clamp Type
Please Note
These four variants are not interchangeable. Per GSE's general clamp engineering datasheet, clamp size relates to module thickness on GSE's standard In-Roof frames: H16 suits 35 mm modules and H21 suits 40 mm modules (both Portrait system). Note a data conflict on the H27 clamp: GSE's Landscape-specific clamp compatibility table lists the H27 middle clamp (ART106723) as suited to 30–32 mm module frames, while GSE's general clamp engineering datasheet lists H27 as suited to 45–46 mm modules on standard frames. This may reflect a difference between the Landscape and Portrait frame systems, or a labelling variation between documents.
Secure Module-to-Module Fixing
Clamps two adjacent PV module frames down onto the half-frame at a single shared fixing point, keeping the array secure and evenly tensioned across each row.
Four Sizes Across Two Systems
Covers H16 (35 mm), H21 (40 mm), and H27 (45–46 mm) module thicknesses, spanning the Portrait system (H16, H21) and the Landscape system (H27), including both current and V2023-generation GSE parts.
EPDM Seal Pre-Fitted
All four variants are supplied with the EPDM sealing wedge already fitted to the clamp body, simplifying installation and reducing separate parts to source.
Black Finish
A black finish across the range, to blend with dark roof tiles and black-framed modules.
Steel Construction
Built from steel for a robust, durable fixing point designed to withstand UK weather conditions over the system's service life.
Simple Combi-Drill Fitting
Fits with a standard combi drill at a controlled torque. GSE explicitly advises against impact drivers, which can over-tighten and deform the clamp or frame.
Variant Comparison
Variant
Clamp Size
Module Thickness
System
EPDM Seal
Manufacturer Ref
Mid Clamp with EPDM – Black (H16)
H16
35 mm
Portrait
Pre-fitted
ART100482
Mid Clamp Double V2023 EPDM – Black (H16)
H16
35 mm (30 mm on P33 frames)
Portrait (current generation)
Pre-fitted (EPDM foam attached)
ART105904
Mid Clamp – Black (H21)
H21
40 mm
Portrait
Pre-fitted
ART100744
Landscape Middle Clamp 30mm EPDM – Black (H27)
H27
30–32 mm (Landscape table) / 45–46 mm (general clamp datasheet)
Landscape
Pre-fitted
ART106723
Technical Specification
General
Product Type
Solar PV in-roof mounting clamp (mid / double clamp)
System Compatibility
GSE In-Roof System — Portrait and Landscape half-frame ranges (variant-dependent)
Pre-fitted on all three variants — no separate seal required
Installation
Function
Secures the frames of two adjacent PV modules to the mounting frame at a shared fixing point
Required Accessories
GSE fixing screw and washer (sold separately)
Fitting Tool
Standard combi drill — do not use an impact driver
Important Safety Information
In-roof installation involves working with roof structure, weatherproofing, and electrical connections. Installation must follow GSE's official installation manual and comply with MCS, local building regulations, and electrical safety standards. Use a qualified, trained installer.
Frequently Asked Questions
Which variant do I need — H16, H21, or H27?
This depends on your module thickness and frame system. Per GSE's general clamp engineering datasheet: H16 suits 35 mm modules, H21 suits 40 mm modules, both on the Portrait In-Roof system. The H27 clamp (Landscape system) has conflicting sizing across GSE's own documentation — see the note above — so confirm this one directly with GSE or your distributor. Always check your specific module's datasheet for its exact thickness before ordering.
What's the difference between ART100482 and ART105904?
Both are H16 double clamps for the Portrait system with a pre-fitted EPDM seal, sized for 35 mm modules on GSE's standard frames. ART105904 is GSE's current V2023-generation part with EPDM foam factory-attached; ART100482 is the equivalent clamp from GSE's earlier part numbering.
What module thickness is the H21 clamp for?
The H21 mid/double clamp (ART100744) is sized for PV modules with a 40 mm thickness on GSE's standard In-Roof frames, per GSE's official clamp engineering datasheet.
Does this clamp come with the EPDM seal?
Yes — all four variants are supplied with the EPDM sealing wedge or foam pre-fitted, so no separate seal needs to be ordered.
Do I need anything else to fit this clamp?
You will still need a matching GSE fixing screw and washer, sold separately, to secure the clamp to the frame.
Can I use an impact driver to fit this clamp?
No. GSE's installation guidance specifically advises against impact drivers for clamp fixing, as they can drive the screw too far and deform the clamp or the module frame. Use a standard combi drill with controlled torque instead.
What does 'double clamp' mean?
GSE's installation manual refers to the mid clamp as a double clamp because it secures two adjacent module frames at once, at the point where they meet within a row.
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Documentation
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